<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>书写模式-竖向</title>
  <style>
    h1 {
      writing-mode: vertical-rl;
      background-color: black;
      color: #FFFFFF;
      padding: .5em;
    }
  </style>
</head>
<body>
<h1>Play with writing modes</h1>
</body>
</html>